Explanation

• The pitch of a sound wave depends on its frequency.
• Pitch tells us whether a sound is high or low.
• Higher frequency → higher pitch (e.g., whistle).
• Lower frequency → lower pitch (e.g., bass drum).
• Frequency is measured in Hertz (Hz).

Last verified on 11-08-2026

Explanation

• The law of universal gravitation was proposed by Isaac Newton.
• He introduced it in 1687 in his famous book Principia.
• It explains that every object attracts every other object.
• The force depends on mass and distance.

Last verified on 27-04-2026

Explanation

• The CPU (Central Processing Unit) is the brain/heart of the computer.
• It processes data and executes instructions.
• It controls other parts of the system.

Additional information:

• First commercial CPU: Intel 4004 (1971)
• Invented by: Italian physicist Federico Faggin
• CPU Examples: Clock speeds – 3.0 GHz, 3.5 GHz, 4.0 GHz, 4.5 GHz, 5.0 GHz

Last updated by NA on 09-09-2026

Explanation

• Ozone (O₃) is mainly found in the Stratosphere, called the ozone layer.
• It absorbs harmful ultraviolet (UV) radiation from the sun, protecting life on Earth.
• Located roughly 15–35 km above the Earth’s surface.

Last verified on 17-01-2026

Explanation

• SEATO was founded on 8 September 1954.
• Pakistan joined SEATO in the same year 1954 as a member.
• It was a Cold War military alliance led by the United States.
• Pakistan later withdrew its association in the 1970s (after 1972/1973 period changes).
• SEATO was officially dissolved in 1977.

Last verified on 29-04-2026

Explanation

• 1962 Constitution: 250 articles, 12 parts, 3 schedules
• It was introduced by Ayub Khan.
• It introduced a presidential system of government.

Additional information:

• 1956 Constitution: 234 articles, 13 parts, 6 schedules
• 1973 Constitution: 280 articles, 7 schedules + Objective Resolution

Last verified on 01-05-2026

Explanation

• Antarctica is the driest and windiest continent in the world.
• It has extremely low rainfall.
• It is known as a polar desert.
• Strong katabatic winds make it the windiest continent.
• It is also the coldest continent on Earth.
• It is located around the South Pole.

Last verified on 20-06-2026

Explanation

• The phrase "Out of the blue" means Unexpectedly/Suddenly.
• It refers to something happening without warning or surprise, like a sudden event or occurrence.

Last verified on 06-08-2026

Explanation

عودِ ہندی مرزا غالب کے خطوط کا مجموعہ ہے۔

یہ اردو ادب میں مکتوب نگاری کی ایک اہم اور ابتدائی مثال سمجھا جاتا ہے۔

اس میں غالب کے خطوط کے ذریعے ان کی نثر، فکر اور اسلوب کی خوبصورتی نمایاں ہوتی ہے۔

Last verified on 02-06-2026

Explanation

• Insolvent means دیوالیہ
• Financially stable مالی استحکام
• Solid means مالیاتی تناظر میں مالی طور پر درست

Last verified on 05-08-2026